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Spring Data Relational support
/*
* Copyright 2019-2023 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.relational.core.sql.render;
import org.springframework.data.relational.core.sql.Expression;
import org.springframework.data.relational.core.sql.Values;
import org.springframework.data.relational.core.sql.Visitable;
import org.springframework.lang.Nullable;
/**
* Renderer for {@link Values}. Uses a {@link RenderTarget} to call back for render results.
*
* @author Mark Paluch
* @since 1.1
*/
class ValuesVisitor extends TypedSubtreeVisitor {
private final RenderTarget parent;
private final StringBuilder builder = new StringBuilder();
private final RenderContext context;
private @Nullable ExpressionVisitor current;
private boolean first = true;
ValuesVisitor(RenderContext context, RenderTarget parent) {
this.context = context;
this.parent = parent;
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.sql.render.TypedSubtreeVisitor#enterNested(org.springframework.data.relational.core.sql.Visitable)
*/
@Override
Delegation enterNested(Visitable segment) {
if (segment instanceof Expression) {
this.current = new ExpressionVisitor(context);
return Delegation.delegateTo(this.current);
}
return super.enterNested(segment);
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.sql.render.TypedSubtreeVisitor#leaveNested(org.springframework.data.relational.core.sql.Visitable)
*/
@Override
Delegation leaveNested(Visitable segment) {
if (this.current != null) {
if (first) {
first = false;
} else {
builder.append(", ");
}
builder.append(this.current.getRenderedPart());
this.current = null;
}
return super.leaveNested(segment);
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.sql.render.TypedSubtreeVisitor#leaveMatched(org.springframework.data.relational.core.sql.Visitable)
*/
@Override
Delegation leaveMatched(Values segment) {
parent.onRendered(builder);
return super.leaveMatched(segment);
}
}